Otherwise, the implication of the droplets not being there are difficult to make sense of.
It's actually got me wondering if we might be seeing some backstory about Rakshas soon that may shed some light on a lot of things, mask included.

I'd be loving that, so I hope so!
Here's my crazy theory: The mask was a punishment that Rakshas' clan made him wear as an outward sign of his shame, kind of like a scarlet letter or something. Maybe what Silat said about a taboo was in reference to that, he was surprised that Rakshas was still abiding by that punishment by wearing the mask, even now. Maybe when the mask was broken, especially by the hand of the clan's current leader, it broke some kind of curse that had been placed upon it which caused the markings to disappear.
I'm not saying I think Silat had been the one to punish Rakshas, but maybe one of his ancestors did.
As to why Rakshas would like the mask if it was a punishment, maybe he felt that even though it originally had negative connotations, it was a tie to his identity and past. Or it might be like a badge of honor to him somehow, like he turned something that was meant to be bad into something he owned and took pride in.